Plate cutting and bevelling machine



Jan. 14, 1964 o. CARDELL 3,117,477

PLATE CUTTING AND BEVELLING MACHINE Filed Feb. 10, 1959 FIG? / I /////J?I INVENTOR. 0L 0 F CardeU.

PM, 612%., 2, PM.

United States Patent PLATE CUTTING AND BEVELLING MACHINE Olof Cal-dell, Sollentuna, Sweden, assignor to Aktiebolaget Svetsmekano, Gothenburg, Sweden, a corporation of Sweden Filed Feb. 10, 1959, Ser. No. 792,428 Claims priority, application Sweden Feb. 12, 1958 2 Claims. (Cl. 83-3) In cutting and bevelling machines it has been considered obvious and correct to have the axis of rotation of the cutting roller located in the same plane at right angles to the plane of feed of the plate as the axis of the supporting roller. In other words, with the plate in horizontal position, it has been considered suitable to have the axes of rotation of the cutting roller and supporting roller or counter-roller located right above each other during the cutting operation. Such registering position of the cutting and supporting rollers has proved possible for cutting thin plates provided that the rollers are prevented from contacting each other and the plate from being entirely cut through and a slight clearance is left between the rollers. However, in cutting thick plates there arise heavy stresses, especially on the cutting rollers which often are likely to break. The object of the present invention is to eliminate this inconvenience.

In cutting and bevellin g machines, the angle between the cutting plane of the cutting roller and the plate and, consequently, the generating line of the supporting roller is equal to the bevel angle. The axes of the cutting roller and supporting roller make a corresponding angle with each other. During the cutting operation the plate is advanced along a usually horizontal plane. In the following description, this plane is termed the plane of feed. The invention is characterized by the fact that the axis of rotation of the cutting roller lies in a plane at right angles to the plane of feed of the plate, said first named plane being located ahead of the corresponding plane of the supporting roller, as viewed in the direction of feed, said last named plane being also perpendicular to the plane of feed, and the rim of the last named roller forming a noncutting supporting face. The displacement of the cutting roller is preferably greater for large-diameter rollers than for small-diameter rollers. It has surprisingly proved that if this simple rule of displacement is borne in mind the previously frequent fractures of the cutting rollers can be entirely eliminated and a satisfactory operation is ensured even in case of very thick plates.

Generally, for the cutting of thick plates the cutting roller should have a greater diameter than for the cutting of thin plates.

The invention is described more closely hereinbelow with reference to the drawing which diagrammatically illustrates the cooperating portions of a cutting roller and a supporting roller for cutting and bevelling. FIGS. 1 and 2 are two projections, at right angles to each other, of the rollers in operation.

Reference numeral 1 denotes the cutting roller the cutting plane of which makes the bevel angle v with the plane of feed 2 along which the plate 3 is advanced during the cutting operation. The plane of feed may be defined by the rectilinear generation line of a supporting or counter-roller 4 and an additional supporting roller 5 on the inlet and/or discharge side. The cutting roller rotates about a shaft indicated by the line 6 in FIG. 1, and the counter-roller 4 rotates around a shaft indicated by the line 7. The axes of rotation are located in planes at right angles to the plane of feed 2. Said planes do not coincide, but are displaced relative to each other as viewed in the direction of feed indicated by the arrow 8 in FIG. 2. The displacement is equal to the distance 2: between 3,117,477 Patented Jan. 14, 1964 the lines 9 and 10 which in FIG. 2 represent the planes containing the axes of rotation. As a result of this displacement, the point 11 which may be termed point of engagement and at which the edge 12 of the cutting roller first engages the plate 3 advancing toward said roller, is located more close to the line (represented by the point 13 in FIG. 2) along which the plate 3 is tangent to the counter-roller. Consequently, the forces acting upon the cutting roller during operation will be distributed more uniformly with consequent decrease of the stresses on the cutting roller.

In FIG. 2, the thickness of the plate 3 is indicated at r. If a plate 3 having a greater thickness 1' is to be cut, a cutting roller of greater diameter should be used. The edge of such a cutting roller 1 is indicated by the circular are 12' in FIG. 2. The diameter of the edge of this roller should be chosen such that the tangent 14' to the cutting roller 1' at the point of engagement 11 with the plate 3' is parallel to the tangent 14 at the point of engagement 11 with the thinner plate 3. In other words, to ensure a satisfactory cutting operation, the tangents to cutting rollers of different diameters at their points of engagement should be parallel to each other. By way of example, if a plate having a thickness of one half of an inch requires a cutting edge diameter of five inches, the cutting edge diameter of a cutting roller for a plate of one inch should be about 13 inches.

In a cutting and bevelling machine comprising a cutting roller and a counterroller arranged in the manner described, it is suflicient to drive the shaft of the cutting roller, whereas the counter'roller 4 may be arranged to rotate freely on its shaft so as to be driven by the plate advancing between the rollers. In this case, it is usually suitable to have the cutting roller provided with a toothed rim. The drive means (not shown) having the shaft S is connected to the toothed rim by suitable pinion gear means. An additional feeding force for advancing the plate between the rollers during the cutting operation is not required, since the plate is advanced merely by engagement with the rotary cutting roller. Alternatively, both the cutting roller and the counter-roller may have non-toothed smooth engaging edges, in which case both rollers should be positively driven. In this case the counter roller 4 is driven by drive means (not shown) having a shaft S provided with pinion gear means connected to a toothed rim on the counter roller.

What I claim is:

1. Bevelling apparatus for longitudinally cutting a longitudinally travelling plate comprising a rotary supporting roller in contiguous engagement with one side of said plate, said supporting roller being rotatable about an axis which is parallel to said plate and which lies in a first plane normal to the direction of longitudinal travel of said plate, and a rotary bevelling roller on the other side of said plate from said supporting roller, said bevelling roller having a bevelled cutting face and being rotatable about an axis which lies in a second plane normal to the direction of longitudinal travel of said plate and which is at an acute angle to the plane of said plate, said second plane being located ahead of said first plane relative to the direction of travel of said plate, the distance between said first and second planes being a function of the thickness of the plate to be cut, said distance being greater for thicker plates and smaller for thinner plates.

2. Bevelling apparatus for cutting a travelling hard plate comprising a rotary supporting roller for engagement with one side of said plate, said supporting roller having a smooth cylindrical peripheral surface for engagement with one side of said plate, said supporting roller being rotatable about an axis which is parallel to said plate and which lies in a first plane normal to the plane of feed, a rotary bevelling roller for cutting the other side of said plate, said bevelling roller having a continuous bevelled cutting face between an outer and an inner periphery and being rotatable about an axis which lies in a second plane normal to the plane of feed of said plate and which is at an acute angle to the plane of feed, said second plane being located ahead of said first plane relative to the direction of the feed of said plate, the distance between said first and said second planes being a function of the thickness of the plate to be cut, said distance being greater for thicker plates and smaller for thinner plates, the point on said outer periphery nearest the plane of feed during bevelling being spaced from said plane of feed, and drive means for positively rotating said rollers.

References Cited in the file of this patent UNITED STATES PATENTS 1,063,298 Smith June 3, 1913 4 Mason Sept. 20, Snyder Dec. 19, Robinson July 24, Hull May 28, Seaman Mar. 25, Parks Oct. 20, Bugatti Apr. 20, Bosshard Sept. 11, Erlert Oct. 5, Klotz Nov. 11,

FOREIGN PATENTS Germany June 1, Austria Sept. 10, 

1. BEVELLING APPARATUS FOR LONGITUDINALLY CUTTING A LONGITUDINALLY TRAVELLING PLATE COMPRISING A ROTARY SUPPORTING ROLLER IN CONTIGUOUS ENGAGEMENT WITH ONE SIDE OF SAID PLATE, SAID SUPPORTING ROLLER BEING ROTATABLE ABOUT AN AXIS WHICH IS PARALLEL TO SAID PLATE AND WHICH LIES IN A FIRST PLANE NORMAL TO THE DIRECTION OF LONGITUDINAL TRAVEL OF SAID PLATE, AND A ROTARY BEVELLING ROLLER ON THE OTHER SIDE OF SAID PLATE FROM SAID SUPPORTING ROLLER, SAID BEVELLING ROLLER HAVING A BEVELLED CUTTING FACE AND BEING ROTATABLE ABOUT AN AXIS WHICH LIES IN A SECOND PLANE NORMAL TO THE DIRECTION OF LONGITUDINAL TRAVEL OF SAID PLATE AND WHICH IS AT AN ACUTE ANGLE TO THE PLANE OF SAID PLATE, SAID SECOND PLANE BEING LOCATED AHEAD OF SAID FIRST PLANE, SAID SECOND THE DIRECTION OF TRAVEL OF SAID PLATE, THE DISTANCE BETWEEN SAID FIRST AND SECOND PLANES BEING A FUNCTION OF THE THICKNESS OF THE PLATE TO BE CUT, SAID DISTANCE BEING GREATER FOR THICKER PLATES AND SMALLER FOR THINNER PLATES. 